body{
    width: 100%;
    height: 1080px;
    /* overflow: hidden; */
    font-family: '阿里妈妈数黑体 Bold';
}

.middle_ele{
    width: 1300px;
    margin: 0 auto  ;
    box-sizing: border-box;
    /* border: 1px solid red; */
}
